Telecommuting, when it does apply, can indeed reduce the load of transportation networks, but not void it as 1/It is sometimes very important for people to meet in person (thus the suggestion of someone in my country that telecommuting should not be done at home but in places dedicated to this purpose in every city) and 2/anything which requires expensive and/or uncommon equipment will still require people to move (as an example, looks like I'm going to spend most of my life in a clean room, that's not the kind of things which I can build at home).

There's also the problem of heavy loads, for which cars will always somewhat be needed. We can eliminate the need for individual cars (and that would be great), but some must still be available for delivering products and for rent in specific events. In short, I don't think we can get rid of cars, only make them technically more efficient and change their purpose to something more sane than taking a heavy 4-place monster to go to work...